[16p-K309-1~10] 3.12 Semiconductor optical devices

3:45 PM - 4:00 PM JST(6:45 AM - 7:00 AM UTC)

[16p-K309-9] Enhanced Visible Light Response and Photoinduced Charge Transfer Dynamics of Gold/Silicon Carbide Composite Nanoparticle Photocatalysts

〇Akihiro Furube¹, Shunsuke Yuyama¹, Tetsuro Katayama¹, Pankaj Koinkar¹ (1.Tokushima Univ.)

Keywords:

silicon carbide,plasmon,ultrafast spectroscopy

In recent years, hydrogen has attracted attention as a high-density and clean energy source, with photocatalytic water splitting being one of the most promising methods. Silicon carbide (SiC), a highly durable semiconductor, is a potential photocatalyst material. However, pure SiC struggles to utilize visible light, and its photocatalytic efficiency is low due to the rapid recombination of photoexcited carriers. To address this, we propose adsorbing gold nanoparticles onto the SiC surface to enhance visible light response through the plasmonic effect and form an electric field at the composite interface, enabling efficient separation of photoexcited carriers. In this study, we employed diffuse reflectance transient absorption spectroscopy to observe charge separation on femtosecond and picosecond scales, elucidating the photocatalytic reaction mechanism under visible light irradiation.